Ivan Čukić

Even more curry for C++11

After my initial post about currying in C++, I was wondering whether it is possible to make a universal curry transformation that will be applicable to any functor.

Fortunately, like most weird things, in C++ the answer to this question is yes.

Here, we’ll create a curry object from a lambda function:

  auto log = make_curry(
      [] (int type, int subtype, const std::string & message)
              << type << " / " << subtype
              << "\t" << message << std::endl;

And use it in all the different ways:

  int main(int argc, const char *argv[])
      auto message = log(1);
      auto error = log(0, 0);

      // Only one argument already given
      message(0, "Normal message");
      message(1, "Important message");

      // We have two arguments already given
      error("No error, just kidding");

      // Or, we can call directly
      log(1, 1, "Arguments: 3 - 0")();
      log(1, 1)("Arguments: 2 - 1");
      log(1)(2, "Arguments: 1 - 2");
      log()(2, 2, "Arguments: 0 - 3");

      return 0;

It allows only to split the function arguments into two sets. I might make it a bit more powerful at some point. I’m a bit sleepy now.

Anyone interested in the code?

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